#photogrid_wrapper{position: absolute; top: 0; left: 0; width: 100%; height: 100%; overflow: hidden; z-index: 10;}
#photogrid div{float: left; position: absolute;}
#photogrid div a{display: block; visibility: hidden; background-color: #000;}
#photogrid div img{display: none;}
#photogrid div.default-size, #photogrid div.default-size a{width: 160px; height: 120px;}
#photogrid div.double-size, #photogrid div.double-size a{width: 320px; height: 240px;}
#photogrid div.double-height, #photogrid div.double-height a{width: 160px; height: 240px;}